Motorola launched the Rokr phone last month as the first mobile with access to Apple's acclaimed iTunes service, the backbone of its iPod music device.
It subsequently invited producers to create podcasts - downloadable blocks of content - for the service. Somethin' Else has been commissioned to make three.
The first is a 45-minute programme in which Radio1 DJ Gilles Peterson interviews rapper Common. The show features some of Peterson's favourite tracks and Common's past hits.
In the two other podcasts, DJ Bobby Friction and journalist Robert Elms take listeners on a musical history tour of London, while hip-hop MC Ramon Rodriguez does the same for New York. Both programmes are 10 minutes long.